/*
 * Copyright � 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace Spring.Aop.Support;

/// <summary>
/// Defines miscellaneous <see cref="System.Type"/> filter operations.
/// </summary>
/// <author>Rod Johnson</author>
/// <author>Aleksandar Seovic (.Net)</author>
public sealed class TypeFilters
{
    /// <summary>
    /// Creates a union of two <see cref="System.Type"/> filters.
    /// </summary>
    /// <remarks>
    /// <p>
    /// The filter arising from the union will match all of the
    /// <see cref="System.Type"/> that either of the two supplied filters
    /// would match.
    /// </p>
    /// </remarks>
    /// <param name="first">
    /// The first <see cref="System.Type"/> filter.
    /// </param>
    /// <param name="second">
    /// The second <see cref="System.Type"/> filter.
    /// </param>
    /// <returns>
    /// The union of the supplied <see cref="System.Type"/> filters.
    /// </returns>
    public static ITypeFilter Union(ITypeFilter first, ITypeFilter second)
    {
        return new UnionTypeFilter(new ITypeFilter[] { first, second });
    }

    /// <summary>
    /// Creates the intersection of two <see cref="System.Type"/> filters.
    /// </summary>
    /// <remarks>
    /// <p>
    /// The filter arising from the intersection will match all of the
    /// <see cref="System.Type"/> that both of the two supplied filters
    /// would match.
    /// </p>
    /// </remarks>
    /// <param name="first">
    /// The first <see cref="System.Type"/> filter.
    /// </param>
    /// <param name="second">
    /// The second <see cref="System.Type"/> filter.
    /// </param>
    /// <returns>
    /// The intersection of the supplied <see cref="System.Type"/> filters.
    /// </returns>
    public static ITypeFilter Intersection(ITypeFilter first, ITypeFilter second)
    {
        return new IntersectionTypeFilter(new ITypeFilter[] { first, second });
    }

    /// <summary>
    /// Union class filter implementation.
    /// </summary>
    [Serializable]
    private sealed class UnionTypeFilter : ITypeFilter
    {
        private ITypeFilter[] _filters;

        public UnionTypeFilter(ITypeFilter[] filters)
        {
            _filters = filters;
        }

        public bool Matches(Type type)
        {
            for (int i = 0; i < _filters.Length; i++)
            {
                if (_filters[i].Matches(type))
                {
                    return true;
                }
            }

            return false;
        }
    }

    /// <summary>
    /// Intersection <see cref="Spring.Aop.ITypeFilter"/> implementation.
    /// </summary>
    [Serializable]
    private sealed class IntersectionTypeFilter : ITypeFilter
    {
        private ITypeFilter[] _filters;

        public IntersectionTypeFilter(ITypeFilter[] filters)
        {
            _filters = filters;
        }

        public bool Matches(Type type)
        {
            for (int i = 0; i < _filters.Length; i++)
            {
                if (!_filters[i].Matches(type))
                {
                    return false;
                }
            }

            return true;
        }
    }

    /// <summary>
    /// Creates a new instance of the
    /// <see cref="Spring.Aop.Support.TypeFilters"/> class.
    /// </summary>
    /// <remarks>
    /// <p>
    /// This is a utility class, and as such has no publicly visible constructors.
    /// </p>
    /// </remarks>
    private TypeFilters()
    {
    }

    // CLOVER:ON
}
